JPS6368407A - Tread pattern in automobile tire - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tread pattern for a motor vehicle tire of radial construction with band reinforcement. This pattern consists of a centrally located rib in a zigzag shape extending circumferentially, and a number of putters 1. These pattern blocks are formed and arranged in the following manner so that they form pairs and exist diagonally as S-shaped blocks when viewed across the tread width. There is. On either side of the rib, longitudinal channels extend in the circumferential direction and are connected to said lateral channels.

Such a well-known tread pattern has good road surface grip and straight-line running stability, and also has good drainage performance and quiet running. The placement and shape of the ribs and blocks as well as all pattern characteristics provide a compromise solution. Depending on the requirements, one and/or the other characteristic is then favored and the pattern is embossed thereby in a predetermined but selectable manner.

For example, the automobile industry is increasingly developing cars with significantly lower drag coefficients, the so-called Cv values, and additionally quieter running engines, so that the driving noise is increasingly determined by the noise emitted by the car tires. . the other 2
, three countries are adopting legislation that will no longer allow high-noise vehicles on the road in the future.

Starting from the recognition that motor vehicle tires must therefore generate only fairly low noise, the object of the invention is to develop a tread pattern with a low noise point of view. At the same time, however, consideration should be given to optimizing the wet running properties, which are important for safety.

This technical problem is solved by a three-part tread pattern, in which the S-shaped block pair consists of a central block Q and a more or less wide shoulder block S, said central block being on the right and They are directly connected to the ribs on the left and are separated from the ribs simply by respective shallow and narrow exhaust grooves.

The central block and shoulder blocks are separated by a deep longitudinal passage section of the peripheral passage.

The pattern block is oriented axially on the shoulder side;
Its edge (measured with respect to the central plane X-X) is then 9
It extends at an angle α from 0° to 80°. The central block is oriented circumferentially in the central rib, its edges extending at an angle β of 35° to 55° (measured with respect to the central plane XX). Furthermore, the blocks are formed in a continuous curved manner or in a polygonal polygonal line configuration.

The central block and the shoulder blocks, each complementary to form a whole, are divided by longitudinal passage sections of a wide peripheral passage, which passage sections (in the plane
−X) extends at an angle γ from 0° to 65°. A transverse passage portion of the peripheral passage is connected to an axially oriented side passage. The central rib, which extends to the right and to the left by means of the peripherally oriented central block Q, now has a width of 25 to 40% of the tread width. This pattern block is provided with laminar fine indentations, which extend approximately parallel to the lateral channels. Each lamina micro-indentation is connected to at least one groove or passageway. On the shoulder side, the pattern block is bounded by a circumferential coupling-off groove.

Contoured in an S-shape divided by a central block by diagonally widening ribs and by a system of wide longitudinal and lateral channels with parallel laminar fine indentations vented at the grooves. By combining a plurality of pattern blocks, a tread pattern with relatively low noise generation can be obtained.

Furthermore, this tread pattern is based on wide, curved side passages, and this tread pattern has a high drainage performance. This property can be further improved if the central rib is additionally provided with a central groove. This characteristic and the lane groove stability combine the shoulder block S into two block parts S, , S,
This can be further improved by longitudinal grooves dividing the surface into two.

Further improvements in reducing noise generation can additionally be achieved by means of structural offsets of the pattern edges. It is also good to provide a shift in a diagonal S-shape. It is also possible to provide an offset in the circumferential section, whereby the pattern block deviates from the section width when viewed from the outside towards the inner side of the tire.

Relatively elongated and wide pattern blocks can also be provided. Furthermore, the groove edges may be provided offset in the overlapping direction. These and further improvements will now be explained in detail on the basis of some examples.

The tread l according to FIG.
a central zigzag rib 2 and a pattern block 3, 4.3' lying in the peripheral direction within.

4', which form pairs across the tread width LB to form an S-shaped pattern.

The pattern blocks 3 3 ′ of one tread half I are separated from each other in the circumferential direction by lateral passages 5 and the pattern blocks 4 4 ′ of the other tread half R are separated from each other in the circumferential direction by lateral passages 6 . There is.

These passages 5.6 are restricted to the shape of an arc. Instead, these may be formed into a polygonal polygonal line shape. Each pattern block reaches from the tread shoulder Ls to the rib 2, and is divided into three parts. There are ribs extending around the right and left shoulder blocks and the center block Q based on the third division.

According to FIG. 2, a shoulder block division is provided. This division is effected by narrow longitudinal grooves 11. This width is at most 3 mm. The depth is small. This depth has a value of at most 3.5-4.0 mm compared to the deep peripheral passages. The longitudinal grooves 11 are a sorting means for the shoulder blocks and an evacuation aid for the laminar fine indentations.

The central block Q is connected to the rib 2 and is separated from the rib only in the radially upper pattern area by an exhaust groove 12. This groove 12 is formed to have a shallow depth and a narrow width. This depth is about 3.5 ~
The value is 4.0mm, and the width is about 2.5-3, O1
The value is 1 Im. l indicates the shift of the diagonal Q-block. Center block Q is shoulder block S
They are separated from each other by deep and wide drainage passages 7-8. The passages are formed in a zigzag pattern and are penetrating in the circumferential direction. The passage sections 7a to 8a extend approximately parallel to the ribs 2. The passage portions 7b, 8b have an elongated state in which they continuously transition into arcuate side passages 5 and 6.

These passages are approximately 7-8 mm deep and approximately 5-6 mm deep.
It is formed with a width of mm. The radius of curvature R of the block wall in the range of block portion SI is the radius of curvature r of the block wall in the range of block portion S2 and central block Q.
larger than

This creates an S-shaped arc that starts approximately axially at the tread edge and rises sharply to the center. The block edge at the shoulder side end of block portion SI is (
(measured relative to the tire center plane X-X) 90° to 80°
, particularly preferably at an angle of 85°.

For this (measured against the tire center plane X-X)
The block edge of the rib end measurement part of the central block Q is 35゛~5
It extends at an angle β of 5°, particularly preferably at an angle of 45”.

The decorative block D is separated from the shoulder block 3.3', 4.4' by coupling-off grooves 9 and 10. Both these grooves and decorative blocks are located at the transition from the tire shoulder to the sidewall (not shown). The coupling/detachment groove and the decorative block are shown folded into the plane of the tread in FIGS. 1 and 2.

Three divisions of the pattern likewise result based on the arrangement of the ribs with shoulder blocks and central blocks connected thereto over the tread width L8.

The middle or central portion m has a width of about 25% to 40% of the tread width La. At that time, the surrounding zigzag passages 7 to 8
are formed one above the other. The overlapped portion is indicated by 2. This overlap point is 0.5 of the width of passages 7 and 8.
The value can be between 2.0 times and 2.0 times.

A further overlap exists at the groove 11 in the shoulder block S according to FIG. This overlapping location is indicated by 14. This can be a value between 1.0 and 5.0 times the width of the groove 11. The length f of the block portion S is approximately 0.15 to 0.35 times the length e of the block SI.

Furthermore, the blocks S and Q are provided with thin layer fine indentations 13. Substantially these laminae extend parallel to and conform to the arcuate block edges. The lamina opens into at least one of the channels 7 to 8 therein or into one of the interruption grooves or exhaust grooves 11 or 12.

The pattern blocks 3.3', 4.4' are arranged in the circumferential direction of the tire with predetermined but selectable block divisions d. At this time, there may be a shift U of the shoulder block (as viewed from the inside to the outside tire side). See opposite points V and W. This deviation U can be made to correspond to a value 0.2 times the block division length d from O.

Another embodiment having a differently shaped tread center region is shown in FIG. Here, the rib 15 has a diagonal groove 1.
6 are provided, by means of which grooves 16 the rib is divided into block portions I7. This diagonal groove 16 is also an exhaust groove 12.
It is formed to the same depth and width.

According to FIG. 4, further means are provided.

The blocks S and Q have thin layer fine indentations 48 which are enlarged in the open area by widened indentations 47. In this region other than the upright surface, the lateral channel 45 widens at a point 46 and is particularly hopper-shaped.

Instead of the rib 42, there may also be a rib 22 with a central groove 23.

This measure serves to improve noise suppression. The widening of the lateral passages supports aquaplaning resistance.

The embodiment according to FIG. 5 serves the same purpose with other means. A layered block Q is subordinate to the central rib 52. The thinned shoulder block S has a longitudinal groove 51,
Or block S' can be provided without it.

What is essential is that the peripheral passages 57 and 58 lie approximately in the midplane x
- It is arranged so that it may extend parallel to X. Additionally, the longitudinal grooves 5I can also have a parallel extension.

An alternative embodiment of the tread pattern is shown in FIG. Here the ribs 22 are formed somewhat wider and have a narrow central groove 23 in the middle. Groove 2
The width of 3 is approximately 3 mm. Depth is approximately 4mm
It is. The overlapping degree y of the grooves is approximately 0.5 times the width of the groove 23. The exhaust groove 12 and the vertical groove 11 are maintained as they are.

The modification of the central groove in the central rib 32 is shown in FIG. The central groove 33 now has an amplitude 30, which amplitude is greater than the amplitude 31 of the zigzag rib. The insensitivity of the lane grooves of the pattern is thereby enhanced. The angle δ of the zigzag groove is approximately 100°. The angular range δ can further be between 30° and 120°.

The entire zigzag central groove can additionally be vented. In FIG. 8, the central groove 23 in the central zigzag rib 22 can be vented by a diagonal exhaust groove 24. These grooves are of similar width and depth to the grooves 12, and they separate the central blocks Q by ribs.

The ribs 22 with the central groove 23 can additionally be provided with thin layer fine indentations. According to FIG. 9, the thin layer is designated 27. These can be evacuated in the central groove 23. According to FIG. 10, the thin layer is designated 28. These can be vented at the outer edges of the ribs.

In order to enhance the lane groove insensitivity, according to FIG. 10, relatively short shoulder blocks having a length E' and relatively long shoulder blocks having a length E are provided alternately. . As a result, there is a deviation of the edges, which may also be caused by the degree of overlap.

According to FIG. 1θ, the side passage 25 is formed to widen into a hopper shape toward the shoulder L8.

(See 26). This further improves aquaplaning resistance and noise reduction. Further thin layer fine indentations 27,28 in the ribs 22 further improve the noise reduction and center abrasion resistance.

The additional measures shown in FIGS. 4 and 8-10 also serve to reduce noise and improve aquaplaning resistance.

A further form of tread pattern is shown in FIG. 11, in which the peripheral grooves 18,19 are formed to extend relatively parallel to the plane X--X, and the ribs 21 are formed obliquely. It has an extension of These measures are possible because they likewise optimize noise and aquaplaning resistance.

[Brief explanation of the drawing]

FIG. 1 is a partial view of a tread pattern, FIG. 2 is a partial view of another pattern shape, and FIGS.
The figure is a partial view of details in the pattern shape,
FIG. 5 is a partial view of yet another different shape, FIG. 6 is a partial view of yet another pattern shape, and FIGS.
Figure O is a partial diagram regarding the details of the pattern shape, and the first
FIG. 1 shows a partial view of yet another unusual shape. Reference number in the figure 1...Tread 2...Zigzag ribs 3.3', 4.4'...Pattern block 5
．． 6...Side passage 7.8...Vertical passage 7a, 8a...Vertical passage portion 7b, 8b...Horizontal passage portion 9.10...Connection/detachment groove Q... ...Central block S ...Shoulder block D ... Decorative block 11 ... Vertical groove 12.24 ... Exhaust groove 13 ... ... Thin layer fine notches 14 ... Overlapping parts 15, 22, 32 ... Ribs 16 ... Diagonal grooves 17 ... Block portions 18, 19 ... Surroundings Groove 2I...Groove 23.33...Central groove 25...Side passage 26...Expansion toward shoulder side 27.28...Thin layer fine notch 30.31...Amplitude 45...Side passage 47...Opening enlarged portion 48...Thin layer fine notch 51...Vertical groove 57.58 ...Vertical passage

Claims (20)

[Claims] (1) A tread pattern in an automobile tire with a radial carcass structure having a band-shaped reinforcement part, in which the tread pattern extends in the peripheral direction and has a zigzag-shaped rib (2) provided in the center, and a peripheral side passage (5, 6) and are made up of diagonally paired S-shaped pattern blocks across the tread width (L_B), which are separated by longitudinal channels (7, 8) extending in the peripheral direction. In such a tread pattern, a three-part tread pattern (1) is provided, with S-shaped block pairs (3, 4; 3'
, 4') each consist of a central block (Q) connected with ribs (2, 22) and a shoulder block (S), said central block having an exhaust groove (12) of slight depth and width.
), and the blocks are separated from the ribs by the vertical passage portions (7a to 8) of the vertical passages (7 to 8), respectively.
a) and as follows: the shoulder block (S) is axially divided by an angle α of 90° to 80° on the shoulder side (measured with respect to the tire midplane X-X); The central block (Q) is oriented at an angle β of 35° to 5 on the rib side (measured with respect to the tire midplane X-X).
They are oriented circumferentially at an angle of up to 5°, and the block parts are curved or polygonally fitted between them, the lateral passages (5-6) being connected to the longitudinal passages ( 7 to 8), and the vertical passage portions (7a to 8a) are arranged so as to be oriented toward the periphery at an angle γ = 0° to 65°. The pattern in the center (m) is the tread width (L_B
), and the pattern block (S) is bounded on the shoulder side by bond-break grooves (9 to 10) extending in a zigzag shape in the circumferential direction, these grooves forming the pattern block (S). A decorative block (D) is provided on the tire shoulder with (S) as an extension of the S-shaped block pair.
), and said pattern blocks (Q, S, D) are provided with laminar fine indentations (13) extending parallel to the lateral channels (5-6) and the channel sections (7b-8b). are provided, each of which has at least one longitudinal passage section or groove section (7, 8, 9, 10, 1
2) A tread pattern characterized by being combined with. (2) The shoulder block (S) has a vertical groove (1
1), and this groove connects the block to the block part (
The tread pattern according to claim 1, characterized in that the tread pattern is divided into S_1, S_2). (3) The tread according to claim 1 or 2, characterized in that the ribs (2, 15) are provided with additional grooves (16) that connect the exhaust grooves (12). pattern. (4) The ribs (2, 22) are provided with a zigzag central groove (23).
The tread pattern according to one of the items. (5) The angle (δ) of the zigzag structure of the groove is from 30° to 12
The tread pattern according to claim 4, characterized in that the tread pattern is within a range of 0°. (6) Claim 4, characterized in that the rib (22) and the groove (23) have parallel edge extensions.
The tread pattern according to item 1 or item 5. (7) The central groove (33) has a different amplitude (30) with respect to the amplitude (31) of the rib (32). The tread pattern according to item 1. (8) Claims 4 to 7, characterized in that the central groove (23, 33) has a groove overlap degree (y) of 0.1 to 3 times the groove width. The tread pattern described in item 1. (9) The central groove (23, 33) is connected to the side exhaust groove (24).
) The tread pattern according to any one of claims 4 to 8. (10) Vertical passages (7 to 8) extending in the peripheral direction are 0.5
10. The tread pattern according to claim 1, wherein the tread pattern has an overlapping degree (z) of grooves having a longitudinal passage width twice as large as . (11) One of claims 1 to 10, characterized in that the shoulder block groove (11) has a groove overlap condition (14) of 1 to 5 times the groove width. Tread pattern as described in section. (12) Block lengths (E, E') in which shoulder blocks (S) provided consecutively in the peripheral direction are alternately different
Claims 1-1 are characterized in that:
The tread pattern according to item 1 of item 11. (13) It is understood that the pattern blocks (S) of both tread halves located at opposite points (v, w) have a block shift (u) with a width of 0 to 0.2 times the block division (d). A tread pattern according to one of claims 1 to 12. (14) According to one of claims 1 to 13, characterized in that the side passage (25) is provided to widen (26) toward the shoulder side (Ls). Tread pattern listed. (15) One of claims 1 to 14, characterized in that the side passage (45) is additionally formed in a hopper shape (46) on the outside of the rising surface.
Tread pattern as described in section. (16) One of claims 1 to 15, characterized in that the ribs (22) are provided with laminar fine indentations (27), which are connected to a central groove (23). Tread pattern as described in section. (17) One of claims 1 to 16, characterized in that the ribs (22) are provided with laminar fine indentations (28), which are connected to the exhaust grooves (12). Tread pattern as described in section. (18) Thin layer fine notches (48
18. Tread pattern according to one of claims 1 to 17, characterized in that each of the openings (47) is provided with one aperture widening (47). (19) Claims 1 to 18, characterized in that the vertical passages (18 to 19; 57 to 58) are arranged to extend parallel to the tire center plane XX.
The tread pattern according to one of the items. (20) The longitudinal groove (51) is provided so as to extend parallel to the tire center plane XX, as set forth in one of claims 1 to 19. tread pattern.